Medical devices for fluid delivery

ABSTRACT

Medical devices and methods for delivering fluid. The medical devices include one or more needles for delivering fluid. The methods may include expanding an expandable member such as an inflatable member to expand an expandable scaffold outward toward a lumen wall.

CROSS REFERENCE TO RELATED APPLICATIONS

This application is a continuation of International Application No. PCT/US2020/066929, filed Dec. 23, 2020, which claims priority to the following U.S. Provisional Applications, the disclosures of which are incorporated herein by reference in their entireties for all purposes: U.S. Prov. App. No. 62/953,348, filed Dec. 24, 2019; U.S. Prov. App. No. 62/953,342, filed Dec. 24, 2019; U.S. Prov. App. No. 62/965,037, filed Jan. 23, 2020; U.S. Prov. App. No. 62/987,779, filed Mar. 10, 2020; U.S. Prov. App. No. 63/017,173, filed Apr. 29, 2020; and U.S. Prov. App. No. 63/073,429, filed Sep. 1, 2020.

All publications and patent applications mentioned in this specification are herein incorporated by reference to the same extent as if each individual publication or patent application was specifically and individually indicated to be incorporated by reference.

FIELD

Intravascular (e.g., perivascular or adventitial) delivery of agents for the treatment of peripheral artery disease.

BACKGROUND

It is estimated that more than 20 million patients have peripheral artery disease (PAD), which can progress to critical limb ischemia (CLI), the most serious form of PAD.

Local luminal drug delivery with drug coated balloons (DCBs) and drug eluting stents (DES) have demonstrated some improvement in patency rates following above-the-knee revascularization, yet DCBs and DES have struggled to demonstrate improved patency following below-the-knee (BTK) interventions. A variety of causes for inconsistent results from DCB for the treatment of BTK PAD have been proposed by leaders in the field, such as: the high prevalence of intimal and medical calcification in BTK lesions that creates a physical barrier to effective drug penetration into the adventitia of the vessel, resulting in the inability to effectively inhibit a key contributor to the restenosis cascade; limited dosage from smaller drug-coated balloons; and wash-off of the drug from the balloon surface during device delivery to the target lesion site.

To address these limitations, recent attempts have been made at treating BTK PAD and CLI with an infusion catheter following primary angioplasty and/or primary atherectomy intervention. Yet inherent limitations remain with current infusion catheter systems, inclusive but not limited to, the use of a single infusion channel, single needle, and/or a fixed length single needle approach. Due to the limitations of existing infusion catheter systems, treating longer lesions can be time consuming, inherently user dependent, and inconsistent in coverage of the delivered therapy, both circumferentially and longitudinally along the length of the lesion.

Approaches are needed that address one or more of the deficiencies set forth above.

SUMMARY OF THE DISCLOSURE

The disclosure is generally related to fluid delivery using medical devices and systems.

One aspect of the disclosure is an intravascular apparatus adapted for delivery of a therapeutic agent into a wall of a target vessel of a human patient. The apparatus may include an inflatable balloon and an expandable infusion scaffold. The scaffold may include at least first and second axially-extending infusion spines circumferentially spaced about an outer surface of the inflatable balloon. The at least first and second axially-extending infusion spines may be parallel with or substantially parallel with a long axis of the inflatable balloon when expanded, and may be expandable upon inflation of the inflatable balloon. The expandable infusion scaffold may be coupled to the outer surface of the inflatable balloon such that a circumferential distance between the at least first and second axially-extending infusion spines increases as an inflation pressure within the inflatable balloon is increased and as the inflatable balloon is expanded. The at least first and second axially-extending infusion spines may include a lumen therein and two or more axially-spaced radial openings therein. The at least first and second axially-extending infusion spines may have therein two or more needles axially movable relative to the corresponding infusion spine between a delivery configuration housed within the infusion spine and a generally radially extending deployed configuration in which each of the two or more needles extends out of one of the radial openings in the infusion spine. The infusion spines may have disposed therein one or more fluid delivery lumens that are in fluid communication with the two or more needles that are in the corresponding infusion spine, the one or more fluid delivery lumens axially movable relative to the corresponding infusion spine.

Any two or more needles in this aspect may be operatively coupled such that they are adapted to be moved axially as a group relative to one of the infusion spines.

Any two or more needles in this aspect may be coupled to an axially moveable rail that is disposed within the infusion spine, wherein the coupling to the rail operatively couples the two or more needles such that they are adapted to be moved axially as a group. Each of the two or more needles may be in fluid communication with a distinct fluid delivery lumen. Each of the two or more needles may be coupled to one of the distinct fluid delivery lumens, optionally with a coupler.

Any of the rails in this aspect may include a plurality of radially outwardly disposed openings, wherein each of the two or more needles may be disposed at a location of one of the plurality of radially outwardly disposed openings.

Any of the two or more needles in this aspect may be in fluid communication with a distinct fluid delivery lumen.

Any two or more distinct fluid delivery lumens in this aspect may be disposed adjacent to each other within and along a portion of the infusion spine.

Any inflatable member in this aspect may include at least a portion that has a cylindrical configuration when inflated, and wherein the at least first and second infusion spines may extend along the portion of the inflatable balloon that has the cylindrical configuration. Infusion spines may extend along at least half of the length of a portion of the inflatable member that has a cylindrical configuration.

Any of the inflatable members in this aspect may have a tapered proximal end and a tapered distal end, and optionally wherein the inflatable member has a cylindrical configuration between the tapered proximal and distal ends.

Any of the inflatable members in this aspect may have a length from 20 mm to 200 mm.

Any of the infusion spines in this aspect may have a region in which they axially overlap with an inflatable member that has a length from 20 mm to 200 mm.

Any of the two or more needles in this aspect may be in fluid communication with a common fluid delivery lumen. A common fluid delivery lumen may be adapted to be moved axially to axially translate the two or more needles relative to the infusion lumen.

Any of the two or more infusion needles in this aspect may be advanced out of the infusion spine with a longitudinal and radial component relative to the long axis of the infusion device. An axial component of advancement may be one of away from a proximal end of the infusion device or toward the proximal end of the infusion device. A radial component of advancement may be one of away from the long axis of the infusion lumen or toward the long axis of the infusion lumen.

Any of the expandable infusion scaffolds in this aspect may be sized and configured to be delivered within and deployed from a delivery sheath or a guide catheter.

Any of the expandable infusion scaffolds in this aspect may be attached to the inflatable balloon along at least a portion of a length of the scaffold, and optionally in a plurality of discrete, axially-spaced regions of the at least first and second spines.

Any of the expandable infusion scaffolds in this aspect, including any of the spines, may be attached to the inflatable member by bonding, optionally with an adhesive.

Any of the expandable infusion scaffolds in this aspect may not be attached to the inflatable balloon, wherein the expandable infusion scaffold may be adapted to be collapsed to a low-profile delivery configuration and delivered on the inflatable balloon.

Any of the inflatable members in this aspect may comprise a non-compliant material.

Any of the inflatable members in this aspect may comprise one or more of a compliant or a semi-compliant material.

Any of the expandable infusion scaffolds in this aspect may have a stiffness that is not constant along a length of the inflatable member.

Any of the infusion spines in this aspect may have a stiffness that is not constant along a length of the inflatable member.

Any of the one or more fluid lumens in this aspect may have a stiffness that is not constant along the length of the inflatable member.

Any number of rail track sub-assemblies (optionally including any rails) in this aspect may have a stiffness that is not constant along the length of the inflatable member.

Any of the infusion spines in this aspect may comprise one or more of nitinol, stainless steel, polymer, polyimide, or a braided member.

Any of the infusion spines in this aspect may include one or more non-permeable membranes.

Any of the one or more fluid lumens in this aspect may comprise one or more of nitinol, stainless steel, polymer, polyimide, or a braided member.

Any of the one or more fluid lumens in this aspect may include one or more non-permeable membranes.

Any number of rails in this aspect may comprise one or more of nitinol, stainless steel, polymer, polyimide, or a braided member.

Any number of rails in this aspect may include one or more non-permeable membranes.

In any apparatus of this aspect, the infusion spines may be spaced from one another and the needles may be spaced from one another such that when an agent is delivered from the needles of the infusion device, substantially an entire vessel wall from a proximal most needle to a distal most needle is exposed to the agent.

Any of the needles in this aspect may include a distal end that is pre-formed (optionally heat-set) to take a perpendicular or near perpendicular configuration (e.g., 60-120 degrees) as it exits the corresponding spine opening.

Any of the infusion needles in this aspect may be made of nitinol.

Any of the infusion needles in this aspect may range in size from 20 gauge to 38 gauge.

In any apparatus of this aspect, at least one infusion needle may have at least one dimension that is different than a corresponding dimension of at least one other needle.

Any infusion spine in this aspect may have therein from two to fifty needles axially movable relative to the spine.

Any of the needles in this aspect may have a length from 0.1 mm to 3 mm.

Any of the needles in this aspect may have a distal opening in fluid communication with one or more fluid delivery lumens.

Any of the needles in this aspect may have a side opening in fluid communication with one or more fluid delivery lumens.

Any apparatus in this aspect may have an axial distance between a distal-most needle and a proximal-most needle that is from 10 mm to 190 mm.

Any apparatus in this aspect may have one or both of distal most needles and proximal most needles that are axially aligned.

Any of the infusion spines in this aspect may not be directly attached to each other.

Any of the infusion spines in this aspect may be directly attached to each other in at least one location along their lengths.

Any of the infusion spines in this aspect may have sections that are parallel to each other when the expandable scaffold is in a collapsed delivery state and when the scaffold is in an expanded state.

This aspect may include any other suitable feature described or claimed herein.

Any of the intravascular apparatuses herein may also be referred to as an infusion device, and vice versa.

One aspect of this disclosure is an intravascular apparatus adapted for delivery of a fluid agent into a wall of a target vessel of a human patient. The apparatus may include an inflatable member (e.g., a balloon) carried by a distal region of an elongate member, the inflatable member having a cylindrical configuration when inflated. The apparatus may also include an expandable infusion scaffold comprising a plurality of axially-extending infusion spines circumferentially spaced about an outer cylindrical surface of the inflatable balloon, the at least first and second axially-extending infusion spines parallel with or substantially parallel with a long axis of the inflatable balloon when expanded upon inflation of the inflatable balloon. The expandable infusion scaffold may be coupled to the outer surface of the inflatable balloon such that a circumferential distance between the plurality of axially-extending infusion spines increases as the inflatable balloon is expanded. The plurality of infusion spines may each define a lumen therein and having a plurality of radial openings therein. Each of the plurality of infusion spines may have therein a plurality of needles axially movable relative to the corresponding infusion spine between a delivery configuration housed within the infusion spine and a generally radially extending deployed configuration in which the plurality needles extends out of one of the radial openings in the infusion spine. Each of the plurality of infusion spines may have disposed therein one or more fluid delivery lumens that are in fluid communication with the plurality of needles that are in the corresponding infusion spine, the one or more fluid delivery lumens axially movable relative to the corresponding infusion spine. Any of the fluid delivery lumens herein may also be referred to as a fluid lumen.

Any inflatable member in this aspect may have a tapered proximal end and a tapered distal end, wherein the cylindrical configuration may be in between the tapered proximal and distal ends.

Any of the plurality of infusion spines in this aspect may have sections that are parallel to each other when the expandable infusion scaffold is in a collapsed delivery state and when the infusion scaffold is in an expanded state.

Any of the plurality of needles in this aspect may be operatively coupled such that they are adapted to be moved axially as a group relative to one of the infusion spines. Any of the plurality of needles may be coupled to an axially moveable rail that is disposed within the infusion spine, wherein the coupling to a rail operatively couples the plurality of needles such that they are adapted to be moved axially as a group.

Any individual or group of needles in this aspect may be in fluid communication with a distinct fluid delivery lumen.

Any rail in this aspect may include a plurality of radially outwardly disposed openings, each of the plurality of needles may be disposed at a location of one of the plurality of radially outwardly disposed openings.

Any individual or group of needles in this aspect may be in fluid communication with a distinct fluid delivery lumen.

Any two or more distinct fluid delivery lumens in this aspect may be disposed adjacent to each other within and along a portion of an infusion spine.

Any of the plurality of infusion spines in this aspect may extend along at least half of a length of a portion of the inflatable member that has the cylindrical configuration.

Any of the inflatable members in this aspect may have a tapered proximal end and a tapered distal end, and wherein the cylindrical configuration may be in between the tapered proximal and distal ends.

Any of the inflatable members in this aspect may have a length from 20 mm to 200 mm.

Any of the infusion spines in this aspect may have a region in which the spine axially overlaps with the inflatable member that has a length from 20 mm to 200 mm.

Any of the expandable infusion scaffolds in this aspect may be attached to the inflatable balloon along at least a portion of a length of the scaffold, and optionally in a plurality of discrete, axially-spaced regions of the plurality of spines.

Any of the expandable infusion scaffolds in this aspect may have a stiffness that is not constant along the length of the inflatable member.

Any rail track sub-assembly in this aspect may have a stiffness that is not constant along the length of the inflatable member.

Any apparatus in this aspect may have an axial distance between a distal-most needle and a proximal-most needle that may be from 10 mm to 190 mm.

Any of the infusion spines in this aspect may have sections that are parallel or substantially parallel to each other when the expandable scaffold is in a collapsed delivery state and when the scaffold is in an expanded state.

This aspect may include any other suitable feature disclosed or claimed herein.

One aspect of this disclosure is a method of delivering a therapeutic agent into a vessel wall. The method may include delivering an inflatable member in an unexpanded state and an expandable infusion scaffold in an unexpanded state to a location within a vessel, the expandable infusion scaffold comprising a plurality of infusion spines extending along at least portion of the inflatable member, the infusion spines each having a plurality of radial openings therein. The method may further include expanding the balloon radially outward by delivering an inflation fluid to a volume within the inflatable member, wherein expanding the inflatable member expands the plurality of infusion spines radially outward and causes the plurality of infusion spines to move towards and into contact with an inner wall of the vessel. The method may further include deploying a plurality of axially-spaced needles from the radial openings in each of the plurality of infusion spines and through the vessel wall. The method may further include delivering a therapeutic agent through the plurality of needles and into the vessel wall. The method may include retracting the needles into the openings in the plurality of infusion spines. The method may include collapsing the infusion scaffold and removing the infusion scaffold and inflatable member from the vessel.

In this aspect, the delivering step may comprise delivering the infusion scaffold attached to the inflatable member.

In this aspect, deploying the plurality of axially-spaced needles may comprise distally translating a rail track within the infusion spine, wherein the needles may all be coupled to the rail track.

In this aspect, deploying the plurality of axially-spaced needles may comprise distally translating individual rail tracks within the infusion spine, wherein the needles may each be coupled to a distinct rail track.

In this aspect, delivering one or more therapeutic agents through the needles and into the vessel wall may comprise delivering fluid through a distinct fluid lumen to each needle in the infusion spine.

In this aspect, delivering one or more therapeutic agents through needles and into the vessel wall may comprise delivering fluid through a common fluid delivery lumen to all of the needles in the infusion spine.

In this aspect, deploying the plurality of axially-spaced needles from the radial openings may comprise deploying the needles at the same time.

In this aspect, delivering the therapeutic agent through the needles and into the vessel wall may comprise exposing a section of at least one of the adventitia and the media within the vessel wall of at least 5 mm in length to the therapeutic agent without having to move the scaffold axially within the vessel. Exposing a section of the vessel wall to the therapeutic agent may expose substantially all of at least one of the adventitia and media along at least one of a length of the infusion scaffold or a length of the inflatable balloon.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a side view of a distal region of an exemplary infusion device including an expandable scaffold in an expanded configuration.

FIG. 2A is a side view of a distal region of an exemplary infusion device including an expandable scaffold in an expanded configuration.

FIG. 2B is a side view of a distal region of an exemplary infusion device from FIG. 2A with needles deployed from elongate spines of the scaffold.

FIG. 3A is an end view of a distal region of an exemplary infusion device with an inflatable member inflated.

FIG. 3B is an end view of a distal region of the exemplary infusion device in FIG. 3A, shown with needles deployed.

FIG. 4A is an end view of a distal region of the exemplary infusion device from FIG. 3A, shown within an exemplary vessel.

FIG. 4B is an end view of a distal region of the exemplary infusion device in FIG. 3A shown with needles deployed and within an exemplary vessel.

FIG. 5 is a distal region of an exemplary infusion device illustrating needles deployed from spines of an expandable scaffold.

FIGS. 6A, 6B, 6C and 6D illustrate views of portions of an exemplary needle sub-assembly or rail track sub-assembly.

FIG. 6E illustrates an exemplary needle secured to a fluid delivery lumen.

FIG. 6F illustrates an exemplary rail.

FIG. 6G illustrates a portion of an exemplary infusion spine.

FIG. 7A illustrates a top view of an exemplary needle or rail track sub-assembly.

FIG. 7B illustrates a side view of the exemplary needle or rail track sub-assembly from FIG. 7A.

FIG. 8 is a side view of a plurality of exemplary needles deployed outward from an infusion spine.

FIG. 9 illustrates an exemplary cross section of an exemplary needle or rail track sub-assembly.

FIG. 10 illustrates an exemplary cross section of an exemplary needle or rail track sub-assembly.

FIGS. 11A and 11B illustrate side and end views, respectively, of an exemplary infusion device in a collapsed lower profile delivery configuration.

FIGS. 11C and 11D illustrate side and end views, respectively, of the exemplary infusion device from FIGS. 11A and 11B in an expanded configuration with needles deployed.

FIG. 12 illustrates a distal region of an exemplary infusion device in an expanded configuration.

FIG. 13 is a side view illustrating an exemplary infusion device, including a proximal region positioned to be disposed outside of a patient.

FIG. 14 is a side view of an exemplary proximal region of an exemplary infusion device, including an exemplary actuator.

FIGS. 15A and 15B are proximal end views of a proximal external region of an exemplary infusion device.

FIG. 16 is a side view illustrating an exemplary manner in which an inflatable member may be secured to an infusion device.

DETAILED DESCRIPTION

The disclosure herein is related to methods, devices and systems for the delivery of one or more therapeutic agents for the treatment of peripheral artery disease. The methods, devices and systems herein are adapted to efficiently and reliably deliver the desired dose of agent to a target region of adventitial tissue, particularly compared to existing drug coated balloons (DCB), drug eluting stents (DES), and single-needle delivery devices.

The infusion devices herein may include a plurality of deployable needles, which are spaced axially (also referred to herein as longitudinally) and circumferentially apart around the infusion device, allowing more uniform circumferential coverage and a greater span of tissue along the lesion length to be targeted with the agent without having to move the infusion device within the vessel. It is of course understood that any of the treatments herein may include delivering an agent, after which the infusion device may be moved to a different location within the vessel before again delivering the same or a different agent.

Additionally, the infusion devices herein may be positioned against a vessel wall upon application of a radially outward force, which is generally described herein as a force applied by an inflatable member or balloon, although it is conceivable that non-inflatable members may alternatively be used. After the infusion device is apposed against the vessel wall, the needles can be deployed outward such that they pierce through the vessel wall and optionally into the adventitia layer of the vessel wall. Once the needles have been advanced into the wall and optionally into the adventitia, the desired therapeutic agent is delivered though the needles, out of the needles, arid into the target tissue within the vessel wail. In some methods, the volume and rate of infusion may be controlled based on one or more of a desired lesion length and/or desired volume of agent infusion.

One or more of any of the following therapeutic agents or types of agents, including but not limited to any combination thereof, may be delivered from the infusion devices herein during any of the methods of use herein: antiplatelet agents; anti-inflammatory agents; antiproliferative drugs as referred to as cell-proliferation inhibitors; immunosuppressants such as mTOR and IMDH inhibitors; anticoagulation drugs; antithrombotic agents; lipid-lowering drugs; angiotensin-converting enzyme (ACE) inhibitors; and stem cells. While the disclosure herein focuses on PAD, the device and systems herein may be used to treat alternative conditions, such as, for example only, chronic obstructive pulmonary disease (“COPD”), which is described in U.S. Prov. App. No. 62/953,342, which is incorporated by reference herein in this regard. Agents that may be delivered to treat COPD, for example, include but are not limited to anti-inflammatory agents, receptor antagonists, and neurotoxins.

The disclosure that follows describes non-limiting exemplary infusion devices that are adapted and configured to deliver one or more therapeutic agents and provide one or more of the advantages set forth herein, such as efficiently delivering a desired volume or dose to a target region of tissue in the vessel wall.

FIG. 1 illustrates a distal region of an example of an infusion device. Infusion device 100 includes an expandable infusion scaffold 110 that includes at least first and second infusion spines 112 a, 112 b, and 112 c (three shown in this example), which are shown in FIG. 1 in expanded configuration with the infusion needles deployed. Unless indicated herein to the contrary, the infusion spines herein may also be referred to as a plurality of infusion spines. Infusion spines are sized, positioned, and configured to be expandable by a generally radially outward force, which in this example is applied by an inflatable member 150. Any of the inflatable members herein may include one or more of a compliant material (e.g., polyurethane or silicone), a non-compliant material (e.g., polyester or nylon), or a semi-compliant material. As shown, the infusion spines 112 a, 112 b and 112 c are circumferentially spaced about an outer surface of the inflatable member 150 with a long axis (LA) of the infusion device when the spines are expanded. The long axis in this embodiment is also a long axis of the inflatable member 150. In this example, the spines are parallel (or substantially parallel) with the long axis of the infusion device 100 and the inflatable member 150 when expanded, as shown. As used herein, the phrase substantially parallel in this context includes slight deviations from being parallel and includes spines that have configurations that still facilitate the efficient and effective delivery of therapeutic agent to the desired tissue. One of skill in the art will appreciate that substantially parallel as used in this context allows for some deviation from strictly parallel, such as at an angle of five or ten degrees relative to a long axis, for example.

In this example the inflatable member has a cylindrical configuration when expanded, as shown. The term cylindrical as used in this context includes configurations that approximate a cylinder even if not perfectly cylindrical, which may be the case if a plurality of infusion spines are attached or engaging an outer surface of the inflatable member and the balloon does not have a perfectly cylindrical configuration when expanded. Additionally, an inflatable member may still be considered to have a cylindrical configuration even if the inflatable member has at least one end region that is tapered or has any other configuration that is not orthogonal with the long axis, such as the tapered distal and proximal ends of the inflatable member that are shown in FIG. 1. Additionally, for example, an inflatable member with a general dumbbell configuration may be considered to have a cylindrical configuration. Additionally still, when the description herein describes inflatable members having cylindrical configurations when expanded, it refers to the configuration the inflatable member would take after being expanded outside of a patient. This is meant to clarify that when expanded or inflated within a vessel of the patient, there may be one or more anatomical restrictions that prevent the inflatable member from transitioning to the cylindrical configuration it would assume if expanded outside of a patient, such as the configuration of the vessel wall in which the infusion device is placed. In both scenarios, the inflatable member in these examples is considered to have a cylindrical configuration when expanded.

The infusion spines herein may be connected (directly or indirectly) to the inflatable member, such as by bonding, adhesion, or using any other suitable technique for securing the spines to an inflatable member. In any of the examples herein, the spines may alternatively not be connected to the inflatable member, but they are still adapted to be expanded by inflation of the inflation member due to their proximity to the inflatable member. For example, the expandable infusion scaffold may be delivered on or over a balloon-based catheter in a compressed low-profile delivery state, and then expanded by dilating the balloon-based catheter at the intended location within the vessel.

FIG. 1 shows an exemplary inflatable member 150 and an expandable infusion scaffold 110, both in an expanded state or configuration. For delivery, the expandable infusion scaffold is in a collapsed delivery configuration in which the infusion spines are closer to adjacent spines than in the expanded state, such as shown in FIG. 11A. It is understood that FIGS. 11A-11D are an alternative embodiment, and the reference to FIG. 11A is meant to illustrate an infusion scaffold in a collapsed delivery configuration (or at least a configuration in which it is not fully expanded). During delivery, the inflatable member is also in a lower profile unexpanded (and uninflated) collapsed delivery configuration. The internal volume of the inflatable member is also less in the delivery state than in the deployed state. Once the infusion device is delivered to the target location with a vessel, the inflatable member is inflated, which pressurizes the inflatable member. This expansion of the inflatable member causes the inflatable member to increase in a radial dimension and apply a force to the plurality of infusion spines that are disposed around the inflatable member. This causes the spines to expand radially and which also causes the relative circumferential distance between the spines to increase, an example of which is shown in FIG. 11C. The expandable infusion scaffold is thus expanded towards the vessel wall by inflating and expanding the inflatable member.

The inflatable member may have a variety of collapsed states or configurations. For example, the inflatable member may be folded in one or more locations to facilitate its collapse, while in other embodiments the inflatable member may not have a particular or well-defined collapsed state.

The inflatable members herein are sized and configured such that when expanded, the plurality of infusion spines will be moved radially outward and in contact or substantial contact with the vessel wall. It is understood that due to some variability in vessel wall size, some portion of any of the infusion spines may not make direct contact with vessel wall. The inflatable member may be sized such that it may have a deployed diameter that is larger than an intended vessel size to help ensure that the infusion spines are in contact or substantial contact with the vessel wall. Maintaining sufficient pressure in the inflatable member such that the infusion spines are in substantial contact with the vessel wall can help support the needles as they are deployed and pierce through the vessel wall, which is described in more detail below.

Any of the expandable scaffolds herein may have infusion spines that are optionally equidistantly spaced apart along their lengths, an example of which is shown in FIG. 1. For example, two infusion spines may be spaced apart 180 degrees around the inflatable member when the scaffold and infusion spines are expanded. Alternatively, three infusion spines may be spaced apart 120 degrees around the inflatable member when the scaffold and infusion spines are expanded. Alternatively, four infusion spines may be spaced apart 90 degrees around the inflatable member when the infusion spines are expanded, and so forth. In the collapsed delivery state, the infusion spines of the scaffold can also have the same general relative relationship even though they are closer together and not spaced as far apart.

While equal spacing between spines may in some applications provide more complete delivery of the agent to the target tissue around the vessel wall, in alternative examples the infusion spines may not all be equidistantly spaced apart around the inflatable member.

FIG. 16 illustrates a distal portion of an exemplary infusion device, wherein the expandable scaffold is not shown for clarity. In this example, the infusion device includes an inflatable member 1650, which is shown inflated. A distal end of inflatable member 1650 is coupled to inner shaft or member 1670, and a proximal end of inflatable member 1650 is coupled to outer shaft 1672. The inner and outer shafts 1670 and 1672 define therebetween inflation fluid pathway 1674, which is in fluid communication with an interior volume of inflatable member 1650. The inner volume of inflatable member 1650 and fluid pathway 1674 are in fluid communication with a fluid inflation port, such as inflation port 1333 or inflation port 1433 shown in FIGS. 13 and 14, and which are described in more detail below. Alternatively, the inflatable members herein may be secured to the infusion device in a manner that may be the same or similar to known balloon angioplasty catheters, examples of which are described in U.S. Pat. Nos. 4,782,834 and 10,086,175, and which are incorporated by reference herein for all purposes.

Once the expandable inflation scaffold is expanded and in contact with (or at least substantially in contact with) or directly adjacent the vessel wall, each of a plurality of needles are deployed outward from a radial opening in the infusion spine, an example of which is labeled in FIG. 5 as opening 516. FIG. 1 illustrates a plurality of needles deployed from the expandable infusion scaffold, and in this example shows a plurality of needles deployed from each of the infusion spines. Needles 114 a are shown deployed from infusion spine 112 a. Needles 114 b are shown deployed from infusion spines 112 b. Needles 114 c are shown deployed from infusion spines 112 c. In this merely illustrative example, there are three needles shown deployed from each of the infusion spines. In any of the embodiments herein, each infusion spine may be associated with from two to fifty needles, all of which can be deployed from a radial opening in the spine. As used in this context, the term associated refers to needles that are within any particular spine in a delivery state, and are deployable from that particular spine to pierce the vessel wall.

When this disclosure refers to an infusion spine, it is generally referring to one of the infusion spines of the expandable scaffold. Additionally, when a feature is described with respect to any particular or individual infusion spine, it is understood that all of the infusion spines of any particular scaffold may also have any or all of those features. The phrase infusion spine herein may be used interchangeably with the term spine.

The needles in any infusion spine herein are generally axially spaced apart, as shown in the examples of FIGS. 1, 2B and 5, for example. Spacing the needles axially apart can provide maximum coverage of the therapeutic agent along the length of the target lesion, which can increase the volume of tissue that may be targeted by using the infusion devices herein. Additionally, by having a plurality of infusion spines spaced around or about the device, with each infusion spine having a plurality of axially-spaced needles deployable therefrom, the infusion devices herein can ensure or increase the likelihood of delivering the agent to as much target tissue around the vessel as possible without having to rotate or move the infusion device to provide the desired circumferential coverage of the infused agent. It is of course understood that the infusion devices herein may also be moved in between episodes of agent delivery into the vessel wall. In these instances, the needles may be retracted, and the infusion device can be moved to a different location within the vessel or to a different vessel. The inflatable member and the scaffold are generally collapsed (at least partially) before moving the infusion device to a new location.

In any the infusion devices herein, any two axially spaced needles associated with an infusion spine may be spaced from 1 mm to 40 mm apart, such as from 5 mm to 35 mm apart, such as from 10 mm to 30 mm apart, such as from 15 mm to 20 mm apart.

In any of the infusion devices herein, any adjacent pair of three or more needles that are associated with a single infusion spine may be equidistantly spaced apart axially. Alternatively, any adjacent pair of three or more needles associated with a single infusion spine may not be equidistantly spaced apart axially. It is of course understood that any spine herein may only be associated with two needles, and this paragraph is only related to spines that may be associated with more than two needles.

In some illustrative embodiments, any of the infusion devices herein may include from six to 50 needles total. For example, an infusion device with three spines, each associated with two needles, would have six needles total.

FIG. 1 illustrates an example in which the infusion spines do not have the same lengths and do not have distal ends that extend as far distally as at least one other distal end. In this example, the lengths of all of the spines that are shown are different, and none of their distal ends are axially aligned. In any of the infusion devices herein, any of the spines may have lengths that are the same such that their distal ends are axially aligned with any other spine distal end. In this context, the term length generally refers to the portion of the spine that overlaps with the inflatable member rather than a portion of a spine that may also extend proximally from the inflatable member.

The needles in different spines may or may not be axially aligned. For example, the exemplary needle placement in FIG. 1 shows none of the needles being axially aligned with needles in circumferentially adjacent spines. Any of the needles in the different infusion spines, however, may be axially aligned. Likewise, the infusion spines may also be axially aligned. For example, the infusion device may have rows of needles, with the rows spaced apart axially along the length of the infusion device, an example of which is shown in FIG. 5. A row as used in this context refers to two or more needles in different spines that are axially aligned. The apertures in the top and bottom spines in FIG. 11C are axially aligned, which will cause the needles associated with the top and bottom spines in FIG. 11C to be axially aligned when deployed.

In any of the infusion devices herein, the number of needles associated with each of the infusion spines is the same. FIG. 1 shows an example of this, with three needles per infusion spine. In alternatives, the number of needles in each of the infusion spines may not be the same. For example, one spine may be associated with two needles, while a second spine may be associated with three needles. Any of the infusion devices herein may have an expandable scaffold with a plurality of spines, optionally wherein none of the spines has the same number of needles as any other spine.

FIGS. 2A, 2B, 3A, 3B, 4A and 4B illustrate an exemplary infusion device 200 with an expandable infusion scaffold 210 that includes a plurality of infusion spines 212 (one labeled as 212 a). Any suitable feature from FIG. 1 or described elsewhere herein may be incorporated into infusion device 200. Infusion device 200 also includes inflatable member 250 that when inflated and expanded causes the expandable infusion scaffold 210 to expand, described in more detail elsewhere herein. Each of the plurality of infusion spines includes a plurality of radial openings or windows 216 (shown in FIG. 2A), through which the plurality of needles 214 (labeled as 214 a, 214 b and 214 c for the different spines) extend when deployed. FIGS. 2A (side view), 3A (end view) and 4A (end view in an exemplary vessel 275) show the infusion device after the inflatable member 250 has been inflated but with the needles not yet deployed, while FIGS. 2B, 3B and 4B show exemplary needles 214 deployed through the openings in the infusion spines 212. FIG. 4B illustrates the needles 214 piercing through the vessel wall 275 and extending into the adventitia “A.” FIGS. 4A and 4B illustrate intimal “I,” medial “M,” and adventitial “A” layers of the vessel. Any other disclosure herein from any other example may be incorporated into the examples in FIGS. 2A-4B.

Generally, the infusion spines herein include a lumen and a plurality of openings or windows therein, such as openings 216 in FIG. 2A. The needles herein are generally disposed within an infusion spine in a delivery state and are deployed from the infusion spine out of one of the needle openings to pierce the vessel wall. The needles herein may be disposed within and deployed from the infusion spines in a variety of ways. Additionally, the needles herein may be in fluid communication with a fluid source in a variety of ways. The examples below are meant to be illustrative. The needles herein associated with an infusion spine may be deployable at the same time. The needles herein associated with an infusion spine may be deployable by moving them together as a unit, such as if they are coupled to a common axially movable member within the spine. The needles herein associated with an infusion spine may be separately deployable from within the spine.

Each of the plurality of needles associated with an infusion spine may be coupled to an axially moveable member that is disposed within the infusion spine, such that axial movement of the axially moveable member relative to the infusion spine causes the axial movement of the needle relative to the infusion spine.

In some embodiments herein, the needles associated with an infusion spine are all adapted to move together in unison upon the axial movement of an axially movable member, which may be referred to in this context as a common axially moveable member. In some alternatives, the needles associated with an infusion lumen may be axially moved independently from one another, such as when each needle is coupled to its own or individual axially moveable member within the spine.

In some embodiments the axially moveable member (which may be referred to as a rail track) is a separate structure that does not specifically define a fluid lumen, although in these examples the axially moveable member may house therein one of more fluid lumens that are in fluid communication with one or more needles. Additionally, in these embodiments, one or more fluid lumens within the axially movable member may also be moved axially relative to the infusion spine in response to axial movement of the axially moveable member.

FIG. 5 illustrates an exemplary infusion device 500, which may incorporate any of the disclosure related to infusion device 100 shown in FIG. 1 or any other feature described herein. Infusion device 500 includes an expandable infusion scaffold 510, which includes a plurality of infusion spines 512 a, 512 b (a third infusion spine 512 c is not visible in the side view of FIG. 5). The infusion spines 512 a and 512 b each include a plurality of openings 516 through which the needles are deployed. In this example, each of the spines is associated with three needles as shown, but more or fewer may be associated with each infusion spine as is described elsewhere herein.

FIGS. 6A-6F illustrates exemplary features of an exemplary needle subassembly 620 (any of which may be referred to herein as a rail track subassembly, and vice versa), with the infusion spine not shown for clarity. Rail track subassembly 620 is configured to both move the needles to deploy them from the infusion spine openings, as well as provide housing for one or more fluid lumens that are in fluid communication with one or more needles, and such fluid communication to the needles to deliver the agent into the vessel wall when the needles are deployed from the openings in the infusion spine. FIG. 6E illustrates an exemplary needle 614 a coupled to fluid lumen 622 with an optional coupler 624. In other embodiments any of the needles herein may be directly connected to a fluid lumen. The needle 614 a and fluid lumen 622, as shown in FIG. 6E, are then positioned within rail 623, which is shown alone in FIG. 6F. Rail 623 is an example of an axially movable member that is configured to be axially moved to cause the axial movement of a plurality of needles. Rail 623 is also sized and configured to house therein one or more fluid lumens, in this case fluid lumen 622″ and fluid lumen 622′″, as shown in FIG. 6D. As shown in FIG. 6D, in this example each needle is in fluid communication with a distinct or individual fluid lumen, but they are coupled to rail 623 such that they move axially together in unison when rail 623 is moved. With respect to FIG. 6E, each needle is coupled to an individual fluid lumen as shown, then advanced through rail 623 and coupled thereto, as is shown in FIGS. 6A- 6D. FIG. 6D illustrates one example of a plurality of individual fluid lumens 622″ and 622′″ housed or disposed within a lumen of rail 623. Rail 623, at least in this exemplary embodiment, can be moved axially to axially move all of the needles, as well as serve to house the individual fluid lumens therein.

The needle subassembly 623 shown in FIG. 6A can then be positioned in one of the infusion spines, such as by front loading or back loading. When the needle subassembly 620 is loaded into an infusion spine, the needles will deflect radially inward towards the openings 621 that are labeled in FIG. 6F, and the needle subassembly may be positioned in the infusion spine such that the needles are just proximal to the infusion spine openings 616, labeled in the exemplary spine 612 shown in FIG. 6G.

Any of the needles herein may be formed with a natural bias towards a deployed configuration in which the needles extend at least partially radially outward, such as is shown in FIGS. 6A, 6B, 6C, 6D and 6E. When the needles are collapsed radially down or inward for delivery, they may or may not have a perfectly linear configuration due to their naturally biased and curved deployed configuration. When collapsed for delivery, any of the needles may retain a slight curvature in their configuration.

The use of the term rail herein does not necessarily impart any structural limitations. The rails herein may be elongate members that are sized and adapted to be moveable within an infusion lumen to facilitate the movement of one or more needles. Any of the rails herein may be a tubular member or partial tubular member, such as rail 623 shown in FIGS. 6A-6F, or any other elongate member (with or without a lumen) that is sized and configured for axial movement within a spine.

As part of an exemplary manufacturing of a rail track assembly, the needle and corresponding fluid lumen may be front-loaded through the rail. A coupler (e.g., 624″ or 624′″), if used, may be secured (e.g., bonded, welded, or otherwise secured thereto) to the needle and fluid lumen as shown in FIG. 6E. The rail openings 621 may be formed by removing sections of the material of rail 623, which may itself be an elongate tubular member, such as a stainless steel or nitinol tubular member.

Each infusion spine in the exemplary infusion device shown in FIGS. 6A-6F is associated with at least three subcomponents or subassemblies—the infusion needle(s), the infusion lumen(s), and the rail track subassembly housing the respective infusion needle(s) and infusion lumen(s).

In any of the examples herein, any of the fluid delivery lumens may have an outer diameter from 0.001 inches to 0.01 inches, for example. Fluid delivery lumens herein may also be referred to herein as fluid lumens.

In any of the examples herein, any of the axially moveable members (such as any of the rails) may have an outer diameter from 0.005 inches to 0.05 inches.

In any of the examples herein, any of the axially moveable members may have openings (e.g., openings 621) that are axially spaced from 5 mm to 80 mm apart, such as from 10 mm to 50 mm.

In any of the examples herein, any of the axially moveable members may have openings (e.g., openings 621) that have a length from 2 mm to 20 mm.

In any of the examples herein, any of the spines may have an outer diameter from 0.01 inches to 0.08 inches.

In any of the examples herein, any of the spines may have openings (e.g., openings 216, 516) that are axially spaced apart from 5 mm to 80 mm.

In any of the examples herein, any of the spines may have openings (e.g., openings 216, 516) may have openings with a diameter or length dimension from 0.05 mm to 10 mm.

FIGS. 7A and 7B, in top and side views, respectively, illustrate an exemplary rail track subassembly 720 (spine not shown for clarity), with three exemplary needles in deployed configurations. Any of the features from assembly 620 of FIG. 6A may be incorporated into assembly 720. Rail track subassembly 720 includes rail 723, which has openings 721 therethrough (only one of which is labeled in FIG. 7A), and in this example there are three openings 721 in rail 723. Needles 714 a are coupled to individual and distinct fluid lumens 722, optionally via couplers 724 but alternatively directed connected thereto, which may be secured to rail 723 to secure the needle to the rail 723 and provide unitary axial movement of the needles 714 (which are individually labeled as 714 a′, 714 a″, and 714 a′″).

FIGS. 7A and 7B also illustrate how fluid lumens may extend through the rail 723 lumen. For example, fluid delivery lumen 722′ is in fluid communication with needle 714 a′ and extends through rail 723. Fluid delivery lumen 722′ extends adjacent to central needle 714 a″ and fluid delivery lumen 722″, as shown in the central regions of FIGS. 7A and 7B. In the proximal region shown in FIGS. 7A and 7B, all three fluid delivery lumens 722′, 722″ and 722′″ are adjacent one another within the rail 723. Any of the fluid delivery lumens herein may include a bend or deviation in its path such that it can pass next to a different needle and its associated fluid delivery lumen, which is shown in FIGS. 7A and 7B. In this manner, the needles can extend in the same direction from the spine, which can be seen in the top view of FIG. 7A. In the top view of FIG. 7A, the needles are all extending upward, or out of the page.

In some embodiments, the axially movable member may also define a fluid lumen that is in fluid communication with one or more needles, such as in the example shown in FIG. 8. FIG. 8 illustrates an exemplary needle assembly 820 shown within an exemplary spine 812 a, which includes top or radially outward openings 816. Needle assembly 820 is an axially movable member that in this embodiment also defines a fluid delivery lumen as shown that is in fluid communication with all of the needles 814 a. Needles 814 a are shown in their deployed configuration (tissue not shown for clarity) extending out of the spine openings 816. Any other feature from any other example herein may be incorporated into the features shown in FIG. 8, including use with any other inflatable member herein.

In some alternative embodiments, the needles may be extending from an infusion spine when the infusion device is in a collapsed delivery configuration. FIGS. 11A-11D illustrate such as example, with infusion device 1100 shown in a collapsed configuration in FIGS. 11A and 11B, and expanded in FIGS. 11C and 11D (the needles are shown only in FIGS. 11B and 11D for clarity). FIGS. 11A and 11C are side views, and FIGS. 11B and 11D are end views. As shown in FIG. 11B, needles 1114 a are tucked within folded sections of inflatable member 1150 in the collapsed delivery state. Inflatable member 1150 may include sections of the material that are easier to fold to facilitate the predictable folding of the balloon around the infusion spines and needles, as shown in FIG. 11B. An exemplary guidewire 1154 disposed within guidewire lumen 1155 is also shown, which may be used to deliver any of the infusion devices herein using known guidewire delivery techniques and methods. FIGS. 11A and 11B also illustrate generally collapsed delivery configurations of spines and an inflatable member, which may be incorporated with any of the other examples herein wherein the needles are not deployed until the inflatable member is expanded. The inflatable members herein need not, however, collapse in a predictable manner as is shown in FIG. 11B.

Any of the lumens herein (e.g., infusion spine lumen, rail lumen, and/or fluid lumen) may have or benefit from having one or more regions with sufficient flexibility to allow for the infusion device to be delivered to the target location in the vasculature. For example, any of the lumens herein may incorporate a tubular member with one or more regions with one or more cuts therein (e.g., a laser cut or other technique) that imparts some degree of flexibility along at least a portion of its length. Cuts made in any tubular member herein may be in the form of, for example without limitation, including combinations thereof, an at least partial spiral pattern, an at least partial brick pattern, or any other pattern that increases the flexibility of the infusion lumen. More than one pattern may be implemented in any lumen (spine lumen, rail lumen, fluid delivery lumen, etc.), and the shape or configuration of a cut pattern may change along the length of the lumen.

Any of the fluid lumens herein may optionally include a non-permeable membrane on one or both of an inside or the outside, such as an elastomeric membrane (e.g., urethane, silicone, or hydrogel), which can prevent fluid from leaking therethrough. For example, any lumens that may include or more cuts therein (e.g., laser cut tubes) may include one or more membranes secured thereto to maintain integrity.

Any of the lumens herein may comprise, for example, any combination of nitinol, stainless steel, polymer tubing, polyimide, braided tubing, or other structural material. Any of the lumens herein may be constructed to provide the desired fluid integrity and/or flexibility when being delivered to the target delivery site.

In some examples, sections of the infusion spine(s) in between needle regions may be more flexible to provide more flexibility at those locations, while the spine regions where the needles are deployed may have relatively higher stiffness to aid the needle piercing through tissue or calcifications. FIG. 12 illustrates an exemplary infusion device 1200, with inflatable member 1250 and scaffold 1210 in expanded configurations or states. Scaffold 1210 includes a plurality of spines 1212 a and 1212 b. Spine region 1207 may be configured to be more flexible than distal region 1209 and proximal region 1211 that are axially adjacent to region 1207. Needles may be present in regions 1209 and 1211, for example. Each spine may have a plurality of regions 1207 that are more flexible that other sections of the spine, any of which may be axially spaced apart with less flexible spine regions in between, which is described in more details with respect to FIG. 13.

FIG. 13 illustrates an exemplary infusion device 1300 shown with expandable member 1350 in an expanded configuration and a plurality of needles 1314 (only one of which is labeled) deployed from openings in spines 1312 (only one spine is labeled, and there may be additional spines and associated needles). In this example, the spines include first regions 1312′ at and around the locations where needles extend through openings therefrom, and regions 1312″ axially adjacent and optionally in between first regions 1312′. First regions 1312′ may be considered to include the spine openings from which the needles extend. First regions 1312′ may be less flexible than regions 1312″. This arrangement may provide sufficient stiffness to the spine region where the needle extends therefrom, helping the needle pierce through tissue (or calcifications), while regions 1312″ can provide more flexibility for tracking and delivery. Any of the spines herein may include first and second regions with different stiffness as in the example of FIG. 13.

As is set forth herein, the scaffold may or may not be attached to the inflatable member. In examples in which the scaffold (including the spines) is attached to the inflatable member, the spines may be secured to the inflatable member along their entire length, or less than their entire length. In some devices, the individual spines may be attached to the inflatable balloon at a plurality of axially spaced sections or regions along its length, and not directly attached to the inflatable member at one or more axially-spaced sections or regions along its length. For example only, with respect to FIG. 13, the plurality of spines may be attached to the inflatable member 1350 in regions 1312′, but not attached directly to the inflatable member 1350 in regions 1312″. Not directly attaching the spines to the inflatable member in regions 1312″ may allow for more movement and flexibility in the more flexible regions 1312″, which may provide more flexibility overall in the region of the scaffold, which can help when delivering the device.

FIG. 13 also illustrates exemplary rail track or needle subassemblies 1320′ and 1320″ within corresponding spines, which may include a plurality of needles and one or more fluid lumens, which are described in more detail herein (there may be as many subassemblies as there are spines).

FIG. 13 also illustrates an exemplary proximal region of infusion device 1300. The proximal region includes an adaptor 1339, which in this example is a three-port adaptor. Adaptor 1339 includes an inflation port 1333 configured to couple to a fluid delivery device (e.g., Inflation Device commonly used with dilatation catheters) to deliver an inflation fluid to inflate expandable member 1350. Adaptor 1339 also houses a guidewire lumen 1341 therein, which is sized and configured to receive guidewire 1337 therein, which may facilitate delivery of any of the infusion devices herein over a guidewire. Adaptor 1339 also includes an actuator coupling region 1335, which may be sized and configured to couple to an actuation member, an example of which is described in more detail with respect to FIG. 14.

Any other feature from any other infusion devices herein may be incorporated into the example in FIG. 13, and vice versa.

FIG. 14 illustrates an exemplary proximal region of an infusion device, any features of which may be incorporated into any of the infusion devices herein. The proximal region includes optionally three-port adaptor 1439, which may house a guidewire lumen 1441 therein that is adapted to receive a guidewire 1437 therein for guidewire delivery. In this example, the proximal handle region includes an actuator 1482 that is in operational communication with the rail track subassemblies to facilitate axial movement thereof, which are generally labeled 1420, but it is understand there may be two or more (such as the three that are shown). The rail track sub-assemblies 1420 may have proximal ends that are attached (directly or indirectly) to an inner surface of actuator 1482, such as by using any suitable bonding technique, which thereby causes the rail track subassemblies to move distally upon distal actuation of the actuator 1482, to thereby deploy the needles from the spine openings. In this example, actuator 1482 has a plunger type construction, with a distal member 1484 that is sized to interface with inner surface 1486 to stop further movement of the actuator 1482. This stop mechanism is an example of a stop mechanism that is adapted to control the distal travel of the actuator 1482. This can be set at any desired distance to control the amount of needle deployment. The proximal portion also includes infusion port 1435, which is adapted to be coupled to a source of therapeutic agent to facilitate delivery thereof through the one or more delivery lumens and to the needles. A proximal region of an exemplary spine 1412 is also shown in FIG. 14, but it is understood that there may be as many spines as there are rail track sub-assemblies. Any other feature from any other infusion devices herein may be incorporated into the example in FIG. 14, and vice versa.

FIGS. 15A and 15B are proximal end views of the proximal region illustrated in FIG. 14, including three-port adaptor 1539, with FIG. 15B highlighting proximal ends of rails 1523 and fluid delivery lumens 1522 housed therein. FIG. 15A illustrates inflation port 1533 generally, guidewire lumen 1541 generally, and proximal ends of rails 1523 and fluid delivery lumens 1522 therein. FIG. 15B focuses on exemplary rails 1523′, 1523″, and 1523′″. In this example each rail 1523 houses therein three fluid delivery lumens, 1522′, 1522″, and 1522′″, respectively. The fluid delivery lumens are in fluid communication with the needles, such that a therapeutic agent may be delivered into the proximal ends of the fluid lumens 1522 and to the needles. Any other feature from any other infusion devices herein may be incorporated into the example in FIGS. 15A and 15B, and vice versa.

Any of the needles may be deployable using an external component (that remains outside the patient) that is operatively coupled to one or more needles of the infusion device. In some exemplary embodiments, all of the needles in the infusion device are deployable in unison, and may be operatively coupled to a common deployment actuator, an example of which is shown in FIG. 14 and described above. It is understood that other mechanisms may be used to deploy the needles, either in unison or not in unison. For example, the external portion (which may be referred to herein as a proximal region of the infusion device) may have more than one actuator, each of which may control a subsection of the plurality of needles.

Any of the needles herein may be referred to as microneedles, and may be comprised of nitinol, stainless steel, and/or a combination of nitinol, stainless steel, and other materials that adapt the needle to be able penetrate into the vessel wall. Any of the needles herein may range in length from 0.1 mm-3 mm and in size from 20 gauge to 38 gauge, for example. For clarity, the lengths and/or size of individual needles may vary relative to any adjacent needles, either in the same spine or different spines. Furthermore, the relative inner diameter, outer diameter, and wall thickness of the individual needles may be uniform relative to adjacent needles, or they may vary relative to any adjacent needles, either in the same spine or different spines. Additionally, any of the needles herein may have at least one of an inner diameter (“ID”) and an outer diameter (“OD”) that varies along the length of the needle.

Any of the expandable infusion scaffolds herein may be configured to be an integral part of the balloon system. Alternatively, any of the expandable scaffolds herein may be configured as an independent structure that works ‘in synergy’ with a balloon-based system but is not attached to the balloon system and is not integral to such. As is described elsewhere herein, and incorporated into these embodiments, the expandable scaffold may take the form of various potential configurations designed to enable infusion lumen structural support and communication with the microneedles while also facilitating circumferential and longitudinal infusion of the intended agent to the target lesion.

In any of the infusion devices herein, the expandable infusion scaffold may comprise two or more infusion lumens extending in a longitudinal (axial direction; proximal-distal) or non-longitudinal pattern along at least a portion of the length of the balloon that is either integral to, or to be used in synergy with the infusion scaffold. Longitudinal in this context refers generally to at least a portion of an infusion lumen that is parallel with a longitudinal axis of inflatable balloon. In some embodiments, the scaffold may comprise two or more infusion lumens extending in a non-longitudinal pattern along at least a portion of the length of the balloon that is either integral to, or to be used in synergy with the infusion scaffold. Any of the infusion lumens herein may have one or more portions that extend longitudinally and one or more portions that extend non-longitudinally. Examples of a non-longitudinal configuration or pattern in this context include a spiral or helical configuration or other non-longitudinal pattern. For the sake of illustration, the following describes infusion lumens that run or extend longitudinally (axially) along at least a portion of the length of the scaffold. “Longitudinally” (and derivative thereof) and “axially” (and derivatives thereof) are generally used synonymously herein. “Linear” may also be used with longitudinal and axial when made in reference to a linear longitudinal or linear axial configuration, such as if parallel to a longitudinal (or long) axis of the infusion device or an inflatable member.

In some exemplary embodiments herein (such as in FIG. 6A-6F), the microneedles are secured (e.g., directly attached, or attached via one or more intermediate components) to a rail or other elongate member that is loaded into and disposed in the infusion spine. Exemplary benefits of this design include, but are not limited to, 1) protection of the balloon, guide catheter, delivery sheath, vessel wall, or any other structure in proximity to the microneedles by isolating the sharp needle points during delivery to the lesion site and/or removal from the lesion site; 2) the ability to use the scaffold to facilitate controlled dilation and optionally micro-penetration of the vessel wall ahead of deploying the infusion needles; and/or 3) added structural support during deployment of the needles. Needles that are secured to tracks or other elongate members herein may also enable the depth of needle deployment to be controlled or adjusted. For example, any of the rails herein may be in operable communication with an external portion (e.g., as shown in FIG. 13-15B), wherein one or more actuators (e.g., rotatable knobs, axially movable sliders) in the external portion may be adapted to be actuated to control the relative degree of motion of the rail track subassembly (e.g., axial translation), and thereby control the length of the needles that exit radially or somewhat radially outward from the infusion spine.

Any of the microneedles herein may also have one or more side holes or ports formed therein in addition to or alternatively to a port at a distal end of the needle. In variations of any of the embodiments herein, the needles may only have side holes and may not have a distal hole. Side ports or holes may enable concurrent infusion at more than one depth within the vessel wall. Exemplary benefits of having one or more side holes in the needle include, but are not limited to, enabling local delivery of the therapeutic agent or diagnostic agent into the medial layer of the vessel as well as deep into the adventitial layer of the vessel.

Any of the rails herein may also be referred to as a support shaft, any of which may be solid or have a lumen therein. The rails herein may be made of any number of potential materials such as nitinol or stainless steel onto which the needles can be bonded or attached (directly or indirectly), and which may optionally be slatted or laser cut along at least a portion thereof to provide enhanced trackability. Additionally, any of the rails herein may be comprised of more than one type of material along the length of the device. Any of the individual needles herein may include a first end that may be straight or linear and the other free end may be pre-formed (e.g., heat set) to take a perpendicular or near perpendicular configuration (e.g. 60-120 degrees) to the surface of the vessel when the needle is in its deployed state. A straight or linear section of a needle may be individually secured (e.g., directly attached) to an axially moveable member such as a rail, allowing the free end to be free to deform and assume its deployed shape (e.g., pre-set shape) as it exits the infusion spine opening.

Axial spacing between needles may be optimized based on the desired anatomical coverage of the agent within the vessel wall, along with spacing to facilitate optimal delivery and trackability of the infusion device to the target lesion.

In any of the embodiments herein, any number of distal ends of individual infusion spines may be axially staggered (or axially offset, or spaced axially) relative to any other infusion spine distal ends, further enhancing trackability of the distal end region of the device (an example of which is in FIG. 1). In any of the embodiments herein, at least two lumens may have distal ends that are axially aligned, but those distal ends may be axially spaced from one or more other infusion lumen distal ends. In this fashion, any number of infusion lumen distal ends may be axially aligned or axially staggered relative to any number of other infusion lumen distal ends. In the exemplary embodiment shown in FIG. 1, the infusion lumens are circumferentially staggered or off-set around or about the scaffold and inflatable member, as well as having distal ends that are axially offset. In the exemplary embodiment shown in FIG. 5, the infusion lumens are circumferentially staggered or off-set around or about the scaffold and inflatable member, but axially aligned at the distal ends.

As described elsewhere herein, the individual rail remains inside the respective infusion spine, serving as a mechanism by which to advance and retract the microneedles. One or more openings (or windows) in the infusion spine provide guidance (or a pathway) for the microneedle(s) to exit the infusion spine and can also be adapted to function as added structural support as the needle penetrates into the vessel wall. Any of the infusion spine windows or openings herein (which may also be described as “space,” and as such may be defined by surrounding structure in the infusion spine, for example) may be configured with a slight tented structure around the perimeter thereof to offer additional guidance and structural support, or they may be configured to be flat or concave relative to the cross-section of the infusion spine. The infusion spines herein may also be configured to have a structure located just distal or just proximal to an opening or window (the structure may define the surface(s) of the “opening”) that is configured to function as an additional intraluminal guide or ramp as the needle advances out of the infusion spine opening.

In any of the examples herein, advancement and retracting of one or more rails or support shafts, to which one or more microneedles are secured (directly or indirectly), may be enabled through a mechanical turn dial (or any other rotatable handle actuator) or any other mechanical actuation mechanism with intuitive settings to guide the user during deployment and retraction of the microneedles.

In any of the examples herein, after the microneedles are deployed, infusion may be initiated using, for example only, a controlled mechanism of volume delivery based on the lesion length and desired volume of agent infusion.

In any of the examples herein, the number of needles per infusion spine may be of any desired number, inclusive but not limited to the range of two to fifty microneedles per infusion spine. In some embodiments, the microneedles may be attached or otherwise secured by techniques such as welding, soldering, mechanical crimping, adhesive, or other techniques to a rail and/or fluid delivery lumen. The needles herein may be bonded directly to a fluid delivery lumen, or they be bonded to one or more intermediate elements such as a coupler. Further, as is described in more details elsewhere herein, the depth of needle deployment may be controlled or adjusted, for example, by utilizing one or more controls in an external portion of the device that may be adapted to control the relative degree of motion of the rail track or support shaft subassembly and thereby control the length of needle that exits radially or somewhat radially outward from the device.

In some examples herein, each needle associated with a spine is in fluid communication with an individual and separate fluid delivery lumen. This may offer several advantages including, but not limited to 1) enabling more tightly controlled dosing through the individual infusion needs; 2) enabling more tightly controlled direction of fluid delivery, and 3) enabling simultaneous delivery of separate complementary therapy agents.

Any of the fluid delivery lumens herein may have one of a variety of cross-sectional shapes inclusive of, but not limited to, round and kidney shaped. This may be done to help reduce the overall profile of the needle assembly without compromising the volume of agent that can be infused through the lumen(s). FIG. 10 is a sectional view through one of three needles associated with a particular spine (spine not shown for clarity). FIG. 10 shows exemplary rail 1023, exemplary needle 1014 and fluid delivery lumens 1022 and 1024 that are in fluid communication with a second and third needle, respectively, which are not shown as they are axially spaced from needle 1014. For example only, needle 1014 may be a proximal needle with two additional needles distal to needle 1014. In this example, rail 1023 is mechanically crimped and has a non-circular outer profile as shown. Fluid delivery lumens 1022 and 1024 have non-circular sectional shapes, which in this example can be approximated to kidney shaped, and may be crescent shaped in other embodiments. Alternatively, FIG. 9 illustrates a cross section of a rail track assembly 920 (920 is also pointing to the rail element) including needle 914 a and fluid delivery lumens 922′ and 922″, wherein the cross section of the rail and the fluid delivery lumens are circular.

Any of the lumens herein may be comprised of one or more materials inclusive of, but not limited to, polyimide, polymer, nitinol, composite, and/or combination thereof. Any of the fluid delivery lumens and needles within a rail may be secured using a variety of potential techniques such as, without limitation, crimping, welding, soldering, potting, adhesive, or other techniques inclusive of a combination thereof. In any of these embodiments, any single needles may thus be in fluid communication with a unique or distinct fluid delivery lumen that is only in fluid communication with that particular needle and not any other needles. In alternatives, a plurality of needles may be in fluid communication with a first fluid delivery lumen, and a different needle may be in fluid communication with a second fluid delivery lumen.

In any of the embodiments herein wherein the expandable scaffold is attached to the inflatable member, the scaffold and/or individual spines may be bonded to the balloon or secured between the balloon and an additional thin walled layer of material, for example.

As disclosed elsewhere herein, in any of the embodiments herein, the infusion scaffold may be independent from the expansion balloon (not integrated therewith), yet is adapted to function in synergy with the expansion balloon. In these embodiments, the scaffold may be deployed prior to inflation of the balloon. For example, upon retraction of an outer scaffold sheath, the scaffold may be adapted to be self-expanding, partially self-expanding, or non-self-expanding. The expansion balloon may be then advanced within the scaffold and dilated to continue to or fully expand the infusion scaffold. The scaffold structure may be deployed passively by retracting an outer sheath (as would a self-expanding stent) or by a mechanical means activated in the handle of the device. The infusion scaffolds herein may be compatible with any off-the-shelf angioplasty balloon, and the balloon may optionally be drug-coated or uncoated. In some of these embodiments, the scaffold may be pre-loaded onto the expansion balloon (yet not attached thereto), with both delivered to the target lesion in unison, and the infusion scaffold may then be expanded as the dilatation balloon is expanded. The scaffolds herein may thus be at least partially deployed with an expansion balloon, but need not be bonded thereto.

In alternative examples, the scaffolds herein may be independent without the use of an expansion balloon. For example, the scaffold may be deployed into a target vessel and expanded radially. Radial expansion may be accomplished passively by retracting an outer sheath (as would a self-expanding stent that is commonly used in the field) and/or by a mechanical mechanism activated in the handle of the device. In an exemplary embodiment, the infusion scaffold is configured and adapted to be expanded using a mechanical mechanism or approach that compresses parts of the infusion scaffold longitudinally. The needles may then be advanced, as is described in more detail herein.

In some methods of use, the expandable scaffolds herein may be delivered about an inflatable member, either attached to the balloon or not. After the inflatable member and scaffold are delivered to the target location within a vessel, an inflation can be delivered to an inner volume within the inflatable balloon to cause its expansion. This balloon expansion applies a force to the expandable scaffold, causing the scaffold and spine to radially expand towards the vessel wall. The balloon can be expanded until the infusion device makes contact with the vessel wall. The needles may then be deployed from the spine opening and through the vessel wall, which is described in more detail elsewhere herein, and optionally by distally advancing one or more rails within the spines. The agent may then be delivered from a fluid source, through the one or more fluid delivery lumens, and out of the one or more needle ports and into the vessel wall optionally including the adventitia. The needles may be retracted by retracting one or more rails, and the scaffold and inflatable member may then be collapsed. The infusion device may then be recaptured (e.g., within a sheath or guide catheter) within a delivery sheath and removed from the patient or delivered to another location for a subsequent agent delivery process. 

What is claimed is:
 1. An intravascular apparatus adapted for delivery of a fluid agent into a wall of a target vessel of a human patient, comprising: an inflatable balloon carried by a distal region of an elongate member, the inflatable balloon having a cylindrical configuration when inflated; an expandable infusion scaffold comprising a plurality of axially-extending infusion spines circumferentially spaced about an outer cylindrical surface of the inflatable balloon, the plurality of axially-extending infusion spines parallel with or substantially parallel with a long axis of the inflatable balloon and extending along the outer cylindrical surface of the inflatable balloon when expanded upon inflation of the inflatable balloon, wherein the expandable infusion scaffold is coupled to the outer cylindrical surface of the inflatable balloon such that a circumferential distance between the plurality of axially-extending infusion spines increases as the inflatable balloon is expanded, each of the plurality of axially-extending infusion spines defining a lumen therein and having a plurality of radial openings therein, each of the plurality of axially-extending infusion spines having therein a plurality of needles axially movable relative to the corresponding infusion spine between a delivery configuration housed within the corresponding infusion spine and a generally radially extending deployed configuration in which each of the plurality of needles extends out of one of the radial openings in the corresponding infusion spine, each of the plurality of axially-extending infusion spines having disposed therein one or more fluid delivery lumens that are in fluid communication with the plurality of needles that are in the corresponding infusion spine, each of the plurality of axially-extending infusion spines further having therein a rail that is axially movable with the plurality of needles and the one or more fluid delivery lumens within a lumen of the rail, the rails each including a plurality of rail radial openings with each of the plurality of needles disposed at a location of one of the plurality of rail radial openings, wherein, in the delivery configuration, each of the plurality of needles is radially constrained by the spine in a generally linear configuration in which a tip of each of the plurality of needles is positioned proximal to the corresponding radial opening in the spine, and wherein, in the deployed configuration, each of the plurality of needles is aligned with the corresponding spine opening, and the tip of each of the plurality of needles extends radially outward and is radially further from the corresponding rail radial opening than when the needle is in the delivery configuration.
 2. The apparatus of claim 1, wherein the balloon has a tapered proximal end and tapered distal end, and the cylindrical configuration is in between the tapered proximal and distal ends.
 3. The apparatus of claim 1, wherein the plurality of axially- extending infusion spines have sections that are parallel to each other when the expandable infusion scaffold is in a collapsed delivery state and when the infusion scaffold is in an expanded state.
 4. The apparatus of claim 1, wherein each of the plurality of needles is in fluid communication with one of the one or more fluid delivery lumens.
 5. The apparatus of claim 1, wherein each of the plurality of needles is in fluid communication with a distinct one of the one or more fluid delivery lumens.
 6. The apparatus of claim 5, wherein two or more of the distinct fluid delivery lumens are disposed adjacent to each other within and along a portion of the corresponding infusion spine and within the corresponding rail lumen.
 7. The apparatus of claim 1, wherein the plurality of axially extending infusion spines extend along at least half of the length of a portion of the balloon that has the cylindrical configuration.
 8. The apparatus of claim 7, wherein the inflatable balloon has a tapered proximal end and a tapered distal end, and wherein the cylindrical configuration is in between the tapered proximal and distal ends.
 9. The apparatus of claim 1, wherein the balloon has length from 20 mm to 200 mm.
 10. The apparatus of claim 1, wherein the plurality of axially extending infusion spines, in a region in which they axially overlap with the inflatable balloon, have a length from 20 mm to 200 mm.
 11. The apparatus of claim 1, wherein the expandable infusion scaffold is attached to the inflatable balloon along a plurality of discrete, axially-spaced regions of the plurality of axially extending infusion spines.
 12. The apparatus of claim 1, wherein the expandable infusion scaffold has a stiffness that is not constant along the length of the inflatable member.
 13. The apparatus of claim 1, wherein one or more of the rails within the plurality infusion spines has a stiffness that is not constant along the length of the inflatable member.
 14. The apparatus of claim 1, wherein, when expanded, the axial distance between a distal-most needle of the infusion device and a proximal-most needle of the infusion device is from 10 mm to 190 mm.
 15. The apparatus of claim 1, wherein all of the plurality of axially extending infusion spines have sections that are parallel or substantially parallel to each other when the expandable scaffold is in a collapsed delivery state and when the scaffold is in an expanded state. 